John H. Lyons



Antitrust and Competition

Washington, D.C.

T: 1.202.371.7333

F: 1.202.661.9006


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John H. Lyons represents clients in connection with antitrust aspects of mergers and acquisitions, government civil non-merger investigations, litigation and corporate compliance counseling. He has handled matters in a wide range of industries but has particular experience in the application of the antitrust laws to electric utilities, oil and gas companies, and financial exchanges.

Mr. Lyons’ representative M&A matters include:

Energy Transactions

  • Allegheny Energy, Inc. in its proposed $4.7 billion acquisition by FirstEnergy Corp.;
  • Coastal Corporation in its $24 billion merger with El Paso Energy Corporation;
  • Duke Energy in its $9.1 billion merger with Cinergy Corp.;
  • Duke Energy and Progress Energy in their proposed $13.7 billion merger;
  • Entergy Corporation in its joint venture with Koch Industries and its acquisitions of the Perryville, Attala, Ouachita and Acadia generating facilities;
  • Exelon Corporation in its proposed $15 billion merger with Public Service Enterprise Group (received Department of Justice clearance) and its proposed $7.5 billion acquisition of NRG Energy;
  • FPL Group in its proposed $11 billion acquisition of Constellation Energy (received Department of Justice clearance);
  • Global Santa Fe Corp. in its $18 billion acquisition by Transocean Ltd.;
  • Great Plains Energy in its $1.7 billion acquisition of Aquila, Inc.;
  • Marathon Ashland Petroleum in its $1.2 billion acquisition of assets from Ultramar Diamond Shamrock;
  • National Grid in its $11.8 billion acquisition of KeySpan and its $2.9 billion sale of the Ravenswood generating station in New York City to TransCanada; and
  • RRI Energy in its proposed $1.6 billion merger of equals with Mirant Corporation;

Other Transactions

  • Ecolab Inc. in its $2.3 billion acquisition of Permian Mud Services;
  • CME Group in its $11.8 billion acquisition of Chicago Board of Trade, its $9.3 billion acquisition of NYMEX, its $1.3 billion index services joint venture with Dow Jones & Company and its $1 billion global preferred strategic partnership with Brazilian exchange operator BM&F Bovespa S.A.;
  • Compaq Computer Corporation in its $25 billion merger with Hewlett-Packard; and
  • Merck KGaA in its $7.2 billion acquisition of Millipore and its $275 million sale of EMD CropBioscience.

Mr. Lyons’ civil non-merger government investigations and litigations include representing:

  • a large regional utility holding company in a Department of Justice investigation into certain of its business practices;
  • National Grid and its subsidiary KeySpan in a Department of Justice investigation and settlement by consent decree of competitive issues in the New York City electricity capacity market, and in federal and state follow-on class actions filed in the Southern District of New York and in New York Supreme Court in Bronx County;
  • a trading company in a nonpublic Department of Justice investigation of outage information sharing and possible collusion among electricity generators in California;
  • New York Mercantile Exchange in its dispute with IntercontinentalExchange (Southern District of New York);
  • Arch Chemicals in its dispute with Advanced Micro Devices (Western District of Texas);
  • a petroleum refiner/marketer in a nonpublic Federal Trade Commission investigation of possible price fixing in Midwest gasoline markets; and
  • El Paso Energy Corporation in administrative litigation before the Federal Energy Regulatory Commission.

Mr. Lyons has been selected for inclusion in The Legal 500 United States.

Bar Admissions

District of Columbia


J.D., American University Washington College of Law, 1994

M.P.A., American University, 1991

A.B., Harvard University, Harvard College, 1983